Keeping note is a very important practice in jotting down an idea. Influence diagram canvas lets you take note very intuitively.
If you want to take a node associated with an element, simply select the element and click on the Note button from the flyover menu item.
Once you edit a note and click ok, a note icon appears on the element. The tooltip on that note icon shows the full note.
If you want to edit the note, simply double click on that note icon, the note will appear in the note editor.
In addition, you can place a note anywhere on the canvas by dragging and dropping a note element from the toolbar.
Once the note is placed on the canvas, you can type on the note editor.